diff --git a/chains/tendermint/codec.go b/chains/tendermint/codec.go
index 34ca72b9..f9db614e 100644
--- a/chains/tendermint/codec.go
+++ b/chains/tendermint/codec.go
@@ -16,4 +16,8 @@ func RegisterInterfaces(registry codectypes.InterfaceRegistry) {
 		(*core.ProverConfig)(nil),
 		&ProverConfig{},
 	)
+	registry.RegisterImplementations(
+		(*core.MsgID)(nil),
+		&MsgID{},
+	)
 }
diff --git a/chains/tendermint/codec_test.go b/chains/tendermint/codec_test.go
new file mode 100644
index 00000000..4c87c50a
--- /dev/null
+++ b/chains/tendermint/codec_test.go
@@ -0,0 +1,39 @@
+package tendermint_test
+
+import (
+	"testing"
+
+	"github.com/cosmos/cosmos-sdk/codec"
+	"github.com/cosmos/cosmos-sdk/codec/types"
+	"github.com/hyperledger-labs/yui-relayer/chains/tendermint"
+	"github.com/hyperledger-labs/yui-relayer/core"
+)
+
+func TestCodec(t *testing.T) {
+	codec := codec.NewProtoCodec(types.NewInterfaceRegistry())
+	tendermint.RegisterInterfaces(codec.InterfaceRegistry())
+
+	orig := tendermint.MsgID{
+		TxHash:   "hoge",
+		MsgIndex: 123,
+	}
+
+	bz, err := codec.MarshalInterface(core.MsgID(&orig))
+	if err != nil {
+		t.Fatalf("failed to marshal from tendermint.MsgID to Any: %v", err)
+	}
+
+	var msgID core.MsgID
+	if err := codec.UnmarshalInterface(bz, &msgID); err != nil {
+		t.Fatalf("failed to unmarshal from Any to core.MsgID: %v", err)
+	}
+
+	tmMsgID, ok := msgID.(*tendermint.MsgID)
+	if !ok {
+		t.Fatalf("unexpected MsgID instance type: %T", msgID)
+	}
+
+	if orig != *tmMsgID {
+		t.Fatalf("unmatched MsgID values: %v != %v", orig, *tmMsgID)
+	}
+}